Malicious PDF — malware analysis report

Static analysis result for SHA-256 b08a22fa7bc8856f…

MALICIOUS

PDF

82.1 KB Created: 2021-09-02 03:17:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7d13528d06a403051d7941f46b28dd38 SHA-1: 20cba586efce2f901b01e2357aaf17b0d3425f12 SHA-256: b08a22fa7bc8856f18b57574e5237a7a8c1e7d1f2b0c74e871c63e93e3cb4ad9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pistant.ru/uplcv?utm_term=cool+fire+dragon PDF link annotation
    • http://broadmoor80.com/clients/866172/File/fametogojowozitixogitidef.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d26246f7c---18258250995.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/32441607820.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/jururozofususexapupuda.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/94972147697.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ce1ab8b35---lemuvis.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/23115044116.pdfIn PDF document text
    • http://xahscw.com/userfiles/file/52566859097.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/9a68b28786ef1c38c2dcba24ebe04679/fiduxenivupijonivej.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/dcb48c9117eddfe85e3db637c9550fe5/42341243572.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/kanotenogoxabotadisowege.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/aeba8f0470469ec0deee9f0f33bc86ab/sanofasopuvawubazo.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/mllca405f5p5qqf50n816asln4/6096910466.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aced9181f25---pefusowod.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/jt3vi2f8i9lq64cjtaapd5g5p4/14151796946.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/fumodonizikuxobapugof.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/jupadeluzedajige.pdfIn PDF document text
    • https://dichocungtoi.com/userfiles/file/22926791544.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/95667735011.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/39578926510.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/welejejepowukozum.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/46610462913.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD66 17684 bytes
SHA-256: d7f6c2e1c76f6d94e7249769996d584af9cfe22991204a8474746f7c03e31334
font_01_sfnt_off00010b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4C 10292 bytes
SHA-256: e04372e4725e5ed523793296f2ba577b1d40374f620325687e1893279360b598
font_02_sfnt_off00012253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12253 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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